<template>
    <div id="root">
        <div class="todo-container">
            <div class="todo-wrap">
                <MyHeader @addTodo="addTodo" />
                <MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo" />
                <MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo" />
            </div>
        </div>
        </div>
</template>

<script>
    //引入School组件
    import MyHeader from './components/MyHeader.vue'
    import MyFooter from './components/MyFooter.vue'
    import MyList from './components/MyList.vue' 
    export default {
        name:'App',
        components:{
            MyHeader,
            MyFooter,
            MyList
        },
        data() {
            return {
                // todos:[
                //     {id:'001',title:'抽烟',done:true},
                //     {id:'002',title:'喝酒',done:false},
                //     {id:'003',title:'开车',done:true}
                // ]

                //从浏览器本地缓存中读取数据
                todos:JSON.parse(localStorage.getItem('todos')) || []
            }
        },
        methods:{
            //添加一个todo
            addTodo(todoObj){
                // console.log('我是App组件，我收到了数据：',todo)
                this.todos.unshift(todoObj)
            },

            //勾选 or 取消勾选一个todo
            checkTodo(id){
                this.todos.forEach((todo) => {
                    if(todo.id === id){
                        todo.done = !todo.done
                    }
                })
            },

            //删除一个todo
            deleteTodo(id){
               this.todos =  this.todos.filter((todo) => {
                    return todo.id != id
                })
            },
            //全选 or 取消全选
            checkAllTodo(done){
                this.todos.forEach((todo) => {
                    todo.done = done
                })
            },
            //清除所有已经完成的todo
            clearAllTodo(){
                this.todos = this.todos.filter((todo) => {
                    return !todo.done
                })
            }
        },
        watch:{
            todos:{
                //开启深度监视
                deep:true,
                handler(value){
                    localStorage.setItem('todos',JSON.stringify(value))
                }
            }
        }
    }
</script>

<style>
    /*base*/
    body {
    background: #fff;
    }

    .btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
    }

    .btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
    }

    .btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
    }

    .btn:focus {
    outline: none;
    }

    .todo-container {
    width: 600px;
    margin: 0 auto;
    }
    .todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    }
</style>